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span class="caption" style="width: 378px;">JP/R.Berto WedhatamaA cement-based decoration attached to the water slide of the Atlantis Water Adventure collapsed on Sunday, injuring four people, including a child at the Ancol Dreamland in North Jakarta.

Police said that the accident occurred at 1.30 p.m. when a cement-based decoration collapsed and fell onto the spiral slide below.

The victims sustained cuts and bruises and were taken to Satya Negara Hospital in Sunter, North Jakarta.

The injured were identified as Anggiat Silitonga, 31, Sulastri, 31, Rianto, 31, and Riki Alvian, 11.

“The decorative structure made of ferrocement collapsed due to corrosion,” said Pademangan Police chief Comr. Ahmad David.

Ferrocement is a mixture of cement and sand reinforced with layers of woven steel mesh and reinforcement steel rods. The mixture is largely used to form relatively thin, compound curved sheets.

Ahmad said that the initial investigations found no problems with the structure or steel framework for the ride.

“We are investigating the scene. We have yet to name any suspects in the incident,” he said, adding that Pademangan Police expect to summon witnesses soon.

He also said that the ride had been closed for the investigation. “The seven-meter tall ride is closed to the public, but the other rides and pools are open,” he said.

PT Pembangunan Jaya Ancol management apologized for the incident.

Company chairman Budi Karya Sumadi said that all medical costs would be paid by the company.

The company denied rumors that the entire structure had collapsed.

Company secretary Budi Rochiyardi said that Ancol Dreamland had performed regular maintenance checks for all rides and structures inside the amusement park.

“Perhaps some parts had been left undetected,” Budi said, as quoted by tempointeraktif.com.

He said the company would check all ferrocement structures in the park to prevent further incidents.

The collapse of the cement structure was the second accident in less than three months at the amusement park.

Fifteen panicked passengers were stuck in their seats in late July this year when the Tornado thrill ride stalled.

Electricity was cut during the incident, leaving passengers hanging upside down in a spinning and tilting motion. The company did not provide compensation to passengers, saying none were injured, even though several filed complaints or requested compensation.

Ancol Dreamland complex, which include beaches, amusement parks, an oceanarium and animal shows, was opened in 1966 and is now one of the favorite weekend destinations for Jakarta residents.